I have a 92 mustang 2.3, 8plugs,2 coils It has a miss that sounds like a bad spark plug wire but here's the catch all the plug wires have been changed and it still does it. But we found that when the tachometer is working I have no power and the miss is really bad. Idles rough. When my tach not working I will have power but you can still hear the miss. Can remove all 4 wires on the front coil and it doesn't make a difference and my converter is red hot.Does anyone have anyhelp for me. PLEASE!